<template>
    <div>
         <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>分类参数</el-breadcrumb-item>
        </el-breadcrumb>  

        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert show-icon  type="warning" :closable="false" title="注意：只允许为第三级分类设置相关参数!
"></el-alert>    
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader
                    expand-trigger="hover"
                    v-model="selectedCateKeys"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange"
                    ></el-cascader>
                </el-col>
            </el-row>

            <!-- tab页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                    <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮 -->
                    <el-button :disabled="isBtnDisabled" size="mini" type="primary" @click="addDialogVisible = true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand" label="#">
                            <template slot-scope="scope">
                                <!-- 循环渲染 Tag标签 -->
                                <el-tag closable @close="handleClose(index,scope.row)" v-for="(item,index) in scope.row.attr_vals" :key="index">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                               <el-button size="mini" type="primary" @click="showEditDialog(scope.row)" icon="el-icon-edit">编辑</el-button>
                               <el-button size="mini" @click="removeParams(scope.row.attr_id)" type="danger" icon="el-icon-delete">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                    <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮 -->
                    <el-button :disabled="isBtnDisabled"  size="mini" type="primary" @click="addDialogVisible = true">添加属性</el-button>
                    <!-- 静态参数表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                         <el-table-column type="expand" label="#">
                            <template slot-scope="scope">
                                <!-- 循环渲染 Tag标签 -->
                                <el-tag closable @close="handleClose(index,scope.row)" v-for="(item,index) in scope.row.attr_vals" :key="index">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                               <el-button size="mini" type="primary" @click="showEditDialog(scope.row)" icon="el-icon-edit">编辑</el-button>
                               <el-button @click="removeParams(scope.row.attr_id)" size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
             </el-tabs>
        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog
        :title="'添加'+ titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed"
        >
        <!-- 添加参数的对话框 -->
       <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
       </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
        </el-dialog>

         <!-- 修改参数的对话框 -->
        <el-dialog
        :title="'修改'+ titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed"
        >
        <!-- 修改参数的对话框 -->
       <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
       </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return{
            //商品分类列表
            catelist:[],
            //级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            selectedCateKeys:[],//级联选择框双向绑定到的数组
            activeName:'many',// 被激活的页签的名称
            manyTableData:[],//动态参数数据
            onlyTableData:[],//静态参数数据
            addDialogVisible:false,//控制添加对话框的显示与隐藏
            // 添加参数的表单数据对象
            addForm:{
                attr_name:'',
            },
            //添加表单的验证规则对象
            addFormRules:{
                attr_name: [
                { required: true, message: '请输入参数名称', trigger: 'blur' }
                 ],
            },
            editDialogVisible:false,//控制修改对话框的显示与隐藏
            // 修改参数的表单数据对象
            editForm:{
                attr_name:'',
                attrId:'',
            },
            //修改表单的验证规则对象
            editFormRules:{
                attr_name: [
                { required: true, message: '请输入参数名称', trigger: 'blur' }
                 ],
            },
        }
    },
    created(){
        this.getCateList();
    },
    computed:{
        //如果按钮需要被禁用，则返回true,否则返回false
        isBtnDisabled(){
            if(this.selectedCateKeys.length !== 3){
                return true
            }else{
                return false
            }
        },
        // 当前选中的三级分类的id
        cateId(){
            if(this.selectedCateKeys.length == 3){
                return this.selectedCateKeys[2];
            }else{
                return null
            }
        },
        // 动态计算标题的文本
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }else{
                return '静态属性'
            };
        }
    },
    methods:{
        //获取所有的商品分类列表
        async getCateList(){
            const {data:res} = await this.$http.get(`categories`);
            if(res.meta.status !== 200){
                return this.$message.error(res.meta.msg);
            }else{
                this.catelist = res.data;
                this.$message.success(res.meta.msg);
            }
        },
        //级联选择框选中项变化，会触发这个函数
        handleChange(){
            this.getParamsData();
        },
        handleTabClick(){
            this.getParamsData();
        },
        //获取参数的列表数据
        async getParamsData(){
             //证明选中的不是三级分类
            if(this.selectedCateKeys.length !== 3){
                this.selectedCateKeys = [];
                this.manyTableData = [];
                this.onlyTableData = [];
                return;
            }else{
                //根据所选分类的Id,和当前所处的面板，获取对应的参数
                const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{
                        sel:this.activeName,
                    }
                });
                if(res.meta.status !==200){
                    return this.$message.error(res.meta.msg);
                }else{
                    res.data.forEach(item => {
                        item.attr_vals = item.attr_vals.length>0?item.attr_vals.split(','):[];
                        //控制文本框的显示隐藏,在每一项中单独添加属性属性值
                        item.inputVisible = false;
                        //文本框中输入的值,在每一项中单独添加属性属性值
                        item.inputValue = '';
                    });
                    console.log('res8888',res.data);
                    if(this.activeName === 'many'){
                        this.manyTableData = res.data;
                    }else{
                        this.onlyTableData = res.data;
                    };
                    this.$message.success(res.meta.msg);
                }
            }
        },
        // 监听添加对话框的关闭事件
        addDialogClosed(){
            //resetFields  对整个表单进行重置，将所有字段值重置为初始值并移除校验结果
            this.$refs.addFormRef.resetFields();
        },
        // 点击按钮，添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid =>{
                if(!valid){
                    return
                }else{
                    const{data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                        attr_name:this.addForm.attr_name,
                        attr_sel:this.activeName,
                    });
                    if(res.meta.status !== 201){
                        return this.$message.error(res.meta.msg);
                    }else{
                        this.addDialogVisible = false;
                        this.getParamsData();
                        this.$message.success(res.meta.msg);
                    }
                }
            })
        },
        // 点击按钮，展示修改对话框
        async showEditDialog(e){
            this.editForm.attrId = e.attr_id;
            console.log('this.editForm.attrId',e.attrId);
            this.editDialogVisible = true;
            const {data:res} = await this.$http.get(`categories/${e.cat_id}/attributes/${e.attr_id}`,{
                params:{
                 attr_sel:this.activeName,
            }
            });
            if(res.meta.status !== 200){
                return this.$message.error(res.meta.msg);
            }else{
                this.editForm.attr_name = res.data.attr_name;
                
                this.$message.success(res.meta.msg);
            }
            console.log('res',res);
        },
        // 点击按钮，添加参数
        editParams(){
            this.$refs.editFormRef.validate(async valid =>{
                if(!valid){
                    return
                }else{
                    const{data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attrId}`,{
                        attr_name:this.editForm.attr_name,
                        attr_sel:this.activeName,
                    });
                    if(res.meta.status !== 200){
                        return this.$message.error(res.meta.msg);
                    }else{
                        this.editDialogVisible = false;
                        this.getParamsData();
                        this.$message.success(res.meta.msg);
                    }
                }
            })
        },
        // 监听添加对话框的关闭事件
        editDialogClosed(){
            //resetFields  对整个表单进行重置，将所有字段值重置为初始值并移除校验结果
            this.$refs.editFormRef.resetFields();
        },
        //根据ID删除对应的参数项
        async removeParams(id){
            // 其提示返回的是promines，不需要解构
            const res = await this.$confirm('此操作将永久删除该数据, 是否继续?', '提示',  {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
                }).catch(err =>err);
                console.log('res',res);
                // 如果用户确认删除，则返回为字符串 confirm
                // 如果用户取消删除，则返回为字符串 cancel
                if(res=='confirm'){
                    const {data:ress} = await this.$http.delete(`categories/${this.cateId}}/attributes/${id}`);
                    if(ress.meta.status != 200){
                        this.$message.error(ress.meta.msg);
                    }else {
                        //提示更新成功
                        this.$message.success(ress.meta.msg);
                        //重新获取用户列表数据
                        this.getParamsData();
                    }
                }else{
                    return this.$message.info('取消删除成功');
                }
        },
        //文本框失去焦点，或摁下了Enter都会触发
        async handleInputConfirm(row){
            if(row.inputValue.trim().length == 0){
                row.inputValue = '';
                row.inputVisible = false;
                return;
            }
            //如果没有return, 则证明输入的内容，需要做后续处理
            row.attr_vals.push(row.inputValue.trim());
            row.inputValue = '';
            row.inputVisible = false;
            //需要发起请求，保存数据到数据库中
            this.saveAttrVals(row);
        },
        //将对 AttrVals 的操作，保存到数据库
        async saveAttrVals(row){
            //需要发起请求，保存数据到数据库中
            const{data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
            {
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(','),
            })
            if(res.meta.status !== 200){
                return this.$message.error(res.meta.msg);
            }else{
                this.$message.success(res.meta.msg);
            }
        },
        //点击按钮，展示文本输入框
        showInput(row){
            row.inputVisible = true;
            //让文本框自动获取焦点
            // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 删除对应的参数可选项
        handleClose(i,row){
            //删除数组中的某一项
            row.attr_vals.splice(i,1);
            this.saveAttrVals(row);
        }
    }
}
</script>

<style scoped>
.cat_opt{
    margin: 15px 0;
}
.el-cascader-menu {
    height: 300px;
}
.el-tag{
    margin: 10px;
}
.input-new-tag{
    width: 150px;
}
</style>